Its age is poorly constrained but is thought to be Namurian (late Mississippian to early Pennsylvanian).

The Log Springs Formation is a sequence of continental red beds interpreted as reworked terra rossa soils and sediments from nearby highlands filling karst topography in the underlying Arroyo Penasco Group.

[2] The lowermost 3 meters of the formation are hematitic shales with numerous 1 to 5 mm oolites or pisolites.

The upper part of the formation is an upward coarsening sequence of crossbedded argillaceous reddish sandstones.

Its clastic beds record the beginnings of tectonic uplift associated with the Ancestral Rocky Mountains.